linux-toradex.git/drivers/dma/qcom, branch v4.11

dmaengine: qcom_hidma: autoload while probing ACPI

2016-11-23T04:17:32+00:00

MODULE_DEVICE_TABLE is used by the kernel to determine which device driver
should be loaded for which platform device. MODULE_DEVICE_TABLE has been
only defined for the device-tree based platforms in the current code.
Defining it also for ACPI based platforms.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: cleanup sysfs entries during remove

2016-11-15T03:28:12+00:00

The 4.8-rc8 kernel is printing duplicate file entry warnings while removing
the HIDMA object. This is caused by stale sysfs entries remaining from the
previous execution.

_sysfs_warn_dup+0x5c/0x78
 sysfs_add_file_mode_ns+0x13c/0x1c0
 sysfs_create_file_ns+0x2c/0x40
 device_create_file+0x54/0xa0
 hidma_probe+0x7c8/0x808

Create hidma_sysfs_init and hidma_sysfs_uninit functions and call them from
the probe and remove path. To do proper clean up, adding the attrs object
to the device data structure to keep it around until remove call is made.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: hide MSI handler when unused

2016-11-14T05:23:52+00:00

The newly added MSI support causes a harmless warning when MSI
is disabled:

drivers/dma/qcom/hidma.c:558:20: error: 'hidma_chirq_handler_msi' defined but not used [-Werror=unused-function]

This adds another #ifdef to match that around the users of the function.

Fixes: 1c0e3e82a7fb ("dmaengine: qcom_hidma: add MSI support for interrupts")
Signed-off-by: Arnd Bergmann 
Acked-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: remove unneeded of_node_put()

2016-11-14T03:38:32+00:00

Device node iterators put the previous value of the index variable, so an
explicit put causes a double put.

Generated by: scripts/coccinelle/iterators/device_node_continue.cocci

Signed-off-by: Wei Yongjun 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: add MSI support for interrupts

2016-11-03T13:25:45+00:00

The interrupts can now be delivered as platform MSI interrupts on newer
platforms. The code looks for a new OF and ACPI strings in order to enable
the functionality.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: protect common data structures

2016-11-03T13:25:45+00:00

When MSI interrupts are supported, error and the transfer interrupt can
come from multiple processor contexts.

Each error interrupt is an MSI interrupt. If the channel is disabled by
the first error interrupt, the remaining error interrupts will gracefully
return in the interrupt handler.

If an error is observed while servicing the completions in success case,
the posting of the completions will be aborted as soon as channel disabled
state is observed. The error interrupt handler will take it from there and
finish the remaining completions. We don't want to create multiple success
and error messages to be delivered to the client in mixed order.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: bring out interrupt cause

2016-11-03T13:25:45+00:00

Bring out the interrupt cause to the top level so that MSI interrupts
can be hooked at a later stage.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: make pending_tre_count atomic

2016-11-03T13:25:44+00:00

Getting ready for the MSI interrupts. The pending_tre_count is used
in the interrupt handler to make sure all outstanding requests are
serviced.

The driver will allocate 11 MSI interrupts. Each MSI interrupt can be
assigned to a different CPU. Then, we have a race condition for common
variables as they share the same interrupt handler with a different
cause bit and they can potentially be executed in parallel. Making this
variable atomic so that it can be updated from multiple processor
contexts.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: break completion processing on error

2016-10-19T13:33:06+00:00

We try to consume as much successful transfers as possible. Now that we
support MSI interrupts, an error interrupt might be observed by another
processor while we are finishing the successful ones.

Try to abort successful processing if this is the case.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul

dmaengine: qcom_hidma: add a common API to setup the interrupt

2016-10-19T13:33:05+00:00

Introducing the hidma_ll_setup_irq function to set up the interrupt
type externally from the OS interface.

Signed-off-by: Sinan Kaya 
Signed-off-by: Vinod Koul